An automatic welding device

Abstract

The application discloses an automatic welding device and belongs to the technical field of welding devices. Mainly comprising a base, a seam welding machine, a displacement assembly, a rotating assembly, and a pressing assembly, a cross sliding assembly, a driving assembly, a centering assembly and a transmission assembly. The automatic welding device of the application enables the pressing head of the pressing assembly to have a floating degree of freedom in the horizontal plane and to be rigidly locked through the cross sliding assembly; when the pressing head is lifted by the reaction force, the internal driving assembly is triggered, the peripheral centering assembly is linked and inwards retracted to clamp and center the four sides of the oil tank, and the transmission assembly drives the single side to overturn upwards after clamping to avoid the seam welding machine. The application effectively eliminates the horizontal deflection force generated when pressing and contacting, avoids initial pressing misplacement, and relies on rigid locking and remaining three side clamping to resist the torsional moment during dynamic roll welding, avoids secondary slip, and improves the forming quality.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and more particularly to an automatic welding device. Background Technology

[0002] In the existing automotive or mechanical fuel tank roll welding process, it is usually necessary to first pre-assemble and position the thin-walled upper and lower shells of the fuel tank, and then the roll welding wheel of the seam welding machine performs circumferential welding along the flange edge. In order to ensure a tight fit between the upper and lower shells during the welding process, the existing automatic welding equipment generally uses a hard silicone column or rigid pressure plate driven by a top cylinder as a pressure joint, which directly applies a vertical downward clamping force to the upper shell of the fuel tank from above, pressing it against the lower shell at the bottom or the follower tray. Then, the entire fuel tank in the clamped state is dragged to rotate and move to complete the continuous roll welding operation of the edge flange.

[0003] However, during the initial mold-fitting stage, the existing rigid or high-friction pressure joints, when pressed vertically into the upper shell of the oil tank, experience rigid force and lack buffering and horizontal guidance. Furthermore, the thin-walled oil tank shell itself is lightweight and lacks restraint when stacked, making it easy for the vertical downward pressure to disrupt the original stacking balance of the upper and lower shells. This causes the stressed upper shell to slide and tilt horizontally, resulting in initial misalignment. Secondly, during the dynamic roll welding stage, the equipment needs to move and rotate the entire oil tank. Since the oil tank flange edges are unrestrained, the roll welding wheels generate tangential drag resistance during the rolling process. The static friction provided by the single vertical press at the center is insufficient to resist the torsional torque caused by rotation under a long lever arm. This easily leads to secondary relative sliding or misalignment of the upper and lower shells when they overcome friction during rotation and bending, affecting the overall forming quality of the oil tank.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides an automatic welding device to solve the technical problems of existing automatic welding devices, which easily cause horizontal skew of the upper and lower shells of thin-walled oil tanks during initial vertical pressing and are prone to secondary torsional misalignment during dynamic rotary roll welding due to the lack of edge constraints, thus affecting the forming quality of the oil tank.

[0006] This invention adopts the following technical solution: an automatic welding device, including a base;

[0007] A seam welding machine, mounted on the base, is used for welding the oil tank;

[0008] A displacement component, mounted on the base, is used to drive the oil tank to move horizontally.

[0009] A rotating component, mounted on the displacement component, is used to support the oil tank and drive the oil tank to rotate.

[0010] A clamping assembly, positioned above the rotating assembly, has a movable housing and a clamping joint;

[0011] A cross-sliding assembly is disposed between the movable housing and the crimp joint, which allows the crimp joint to have floating freedom in the horizontal plane and to be rigidly locked.

[0012] A drive assembly, disposed within the movable housing and connected to the top of the cross-sliding assembly, is used to be triggered when the crimp joint moves upward under a reaction force.

[0013] The centering component is located on the periphery of the movable housing and is connected to the drive component for driving inward to clamp and center the four sides of the oil tank.

[0014] A transmission assembly, disposed between the drive assembly and the centering assembly, is used to drive one side of the centering assembly to flip upward after being clamped by the centering assembly to avoid the seam welding machine.

[0015] Furthermore, the cross-sliding assembly includes a sliding unit, a reset unit, a first baffle, and a second baffle. The sliding unit includes a supporting base plate, an X-axis guide rail, a cross slide block, and a Y-axis guide rail. The reset unit includes an optical axis and a reset spring. The supporting base plate is connected to the bottom end of the driving assembly. The X-axis guide rail is fixed to the bottom surface of the supporting base plate. The cross slide block is slidably disposed on the X-axis guide rail. The Y-axis guide rail is slidably disposed on the bottom surface of the cross slide block and intersects the X-axis guide rail in a cross shape. The first baffle is fixed to the bottom surface of the supporting base plate and located at both ends of the X-axis guide rail. The optical axis is fixed to both sides of the cross slide block and movably passes through the first baffle on both sides. The reset spring is sleeved on the optical axis and its two ends are respectively connected to the side of the first baffle and the side of the X-axis guide rail. The second baffle is fixed to both ends of the Y-axis guide rail. The reset unit is connected between the second baffle and the side of the cross slide block.

[0016] Furthermore, the cross-shaped sliding assembly also includes a locking unit, which comprises a first base plate, a first electromagnet, a second electromagnet, a third electromagnet, a second base plate, and a fourth electromagnet. The first base plate is fixed to the upper surface of the supporting base plate, the first electromagnet is fixed to both sides of the first base plate, the second electromagnet is fixed to the upper surface edge of the cross slide and is magnetically attracted to the first electromagnet, the third electromagnet is fixed to the lower surface edge of the cross slide, the second base plate is fixed between the two second baffles, and the bottom surface of the second base plate is fixedly connected to the upper surface of the pressure joint, and the fourth electromagnet is fixed to the upper surface of the second base plate and is magnetically attracted to the third electromagnet, used to rigidly lock the cross slide when energized.

[0017] Furthermore, the drive assembly includes a trigger unit, which includes a guide sleeve, a side slot, a lifting slide rod, a floating horizontal plate, a support spring, and a trigger plate. The guide sleeve is vertically and symmetrically fixed to the inner top surface of the movable housing. The lifting slide rod is movably disposed at the bottom end of the guide sleeve, and one end extending into the guide sleeve has a step. Both ends of the floating horizontal plate pass through the side slot and are respectively connected to the two steps. The support spring is disposed inside the guide sleeve, and both ends are respectively connected to the upper surface of the step and the inner top end of the guide sleeve. Switches are embedded in the upper and lower surfaces of the side slot of one of the guide sleeves. The switch on the lower surface is used to control the electromagnet to de-energize, and the switch on the upper surface is used to control the electromagnet to be energized and locked. Initially, the floating horizontal plate contacts the lower switch, the trigger plate is vertically disposed on the floating horizontal plate, and the cross sliding assembly is fixedly connected to one end of the two lifting slide rods that pass through the bottom surface of the movable housing.

[0018] Furthermore, the drive assembly also includes a first transmission unit and a second transmission unit. The first transmission unit includes a first transmission shaft and a first gear, and the second transmission unit includes a second transmission shaft and a second gear. The first transmission shaft is horizontally bearing disposed inside the movable housing. The first gear is fixedly sleeved on the first transmission shaft. The second transmission shaft is horizontally disposed above the movable housing and crosses the first transmission shaft. The second gear is fixedly sleeved on the second transmission shaft. A first rack and a second rack are fixedly disposed on adjacent sides of the trigger plate, respectively. The first rack is adapted to mesh with the first gear, and the second rack is adapted to mesh with the second gear.

[0019] Furthermore, the centering assembly includes a first clamping module and a second clamping module. The first clamping module includes a fixed box, an X-axis slide rod, a first drive rack, and a first drive gear. The second clamping module includes a placement box, a second drive gear, a Y-axis slide rod, and a second drive rack. The fixed box is fixed to the side of the movable box. One end of the first transmission shaft extends through into the fixed box. The X-axis slide rod slides up and down along the inner wall of the fixed box. The ends of the two X-axis slide rods that are far apart from each other respectively extend through both ends of the fixed box.

[0020] Two first drive racks are provided and fixed to the opposite faces of the two X-axis slide rods respectively. The first drive gear is fixed to one end of the first transmission shaft that extends into the fixed box. Both first drive racks mesh with the first drive gear. The placement box is fixed to the top of the movable box. The horizontal bearing of the second transmission shaft is provided inside the placement box. The second drive gear is fixedly sleeved on the second transmission shaft. The Y-axis slide rod is slidably arranged up and down along the inner wall of the placement box. The two Y-axis slide rods have their opposite ends movably passing through both ends of the placement box respectively. Two second drive racks are provided and fixed to the opposite faces of the two Y-axis slide rods respectively. Both second drive racks mesh with the second drive gear.

[0021] Furthermore, the centering assembly also includes a clamping unit, which includes four clamping side arms, a connecting ear plate, and a rotating pin. Three of the clamping side arms are respectively fixed to the extended ends of two X-axis slide rods and one of the extended ends of the Y-axis slide rod. The connecting ear plate is fixed to one end of another Y-axis slide rod that extends out of the placement box and is located on the side close to the seam welding machine. The remaining clamping side arm is movably connected to the connecting ear plate through the rotating pin and is used to flip upward during subsequent welding to avoid the seam welding machine.

[0022] Furthermore, the clamping unit also includes a C-shaped chuck, a universal ball, a guide pin, and a buffer spring. The C-shaped chuck is fixed to the inner side of one end of the clamping side arm. The universal ball is disposed opposite to the upper and lower surfaces of the inner wall of one end of the C-shaped chuck, respectively, for contacting the upper and lower flange surfaces of the upper and lower shells of the oil tank. The guide pin is horizontally movably disposed through one end of the C-shaped chuck and the clamping side arm, and one end of the guide pin extending into the C-shaped chuck is fixed with a protruding edge, which is used to contact the flange edge of the upper and lower shells of the oil tank. The buffer spring is sleeved on the guide pin, and its two ends are respectively connected to the protruding edge and the inner wall of the C-shaped chuck.

[0023] Furthermore, the transmission assembly includes a dust cover, a linkage gear, and a lifting rack. The dust cover is fixed to the side of the connecting ear plate and coaxially sleeved on the rotating pin. A notch is provided on its circumferential surface. The linkage gear is fixed on the rotating pin and located inside the dust cover. The lifting rack is fixed to the floating horizontal plate and moves upward sequentially through the movable box and the placement box. Initially, the lifting rack does not mesh with the linkage gear, but is used to mesh with the linkage gear through the notch when the floating horizontal plate moves upward.

[0024] Furthermore, the rotating assembly includes a gearbox, a cantilever bracket, a rotary motor, a bearing platform, and a contouring bracket. The gearbox is fixed to the displacement assembly, the cantilever bracket is fixed to the side of the gearbox, the clamping assembly is fixedly supported at the top of the cantilever bracket, the rotary motor is fixed to the side of the gearbox, the bearing platform is connected to the output end of the gearbox via a rotating shaft on the bottom surface, and the contouring bracket is fixed to the bearing platform for supporting and limiting the lower shell of the oil tank.

[0025] The above-mentioned at least one technical solution adopted in this invention can achieve the following beneficial effects:

[0026] An automatic welding device, by setting a cross sliding component between the movable housing and the crimping joint, enables the crimping joint to generate an adaptive floating displacement in the horizontal plane at the instant it initially presses down vertically and contacts the upper shell of the oil tank. This effectively resolves and releases the horizontal skew force caused by rigid contact, avoiding breaking the original initial stacking balance of the upper and lower shells of the thin-walled oil tank. At the same time, the drive component is triggered when the crimping joint moves upward under the reaction force, which in turn causes the peripheral centering component to retract inward, synchronously pushing and clamping the four sides of the oil tank for centering. Thus, the spatial alignment of the upper and lower shells is completed without inducing initial sliding.

[0027] After the centering action is completed, the cross sliding assembly switches the pressure joint from a floating state to a rigid lock. At the same time, the transmission assembly drives the side of the centering assembly closest to the seam welding machine to flip upward to make room for processing. In the subsequent dynamic roll welding stage, where the entire tank is moved and rotated by the displacement and rotation assemblies, the static friction provided by the rigidly locked pressure joint, along with the lateral physical restraint provided by the centering assembly that maintains the clamping state on the remaining three sides, forms a multi-dimensional constraint. This effectively resists the tangential drag resistance generated during the rolling process of the roll welding wheel and the rotational torsional torque under the long lever arm, preventing secondary relative sliding or misalignment of the upper and lower shells of the tank during dynamic processing, thus ensuring and improving the overall forming quality of the tank. Attached Figure Description

[0028] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0029] In the attached diagram:

[0030] Figure 1 This is an overall schematic diagram of an automatic welding device according to this application;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of the mid-to-mid component in use;

[0032] Figure 3 for Figure 2 Schematic diagram of the structure of the center seam welding machine;

[0033] Figure 4 for Figure 2 Schematic diagram of the displacement component and the rotation component;

[0034] Figure 5 for Figure 4 A schematic diagram of the planar structure;

[0035] Figure 6 for Figure 4 A partial structural diagram;

[0036] Figure 7 for Figure 6 A magnified structural diagram at point A;

[0037] Figure 8 for Figure 4 A magnified structural diagram at point B;

[0038] Figure 9 for Figure 5 A magnified structural diagram at point C;

[0039] Figure 10 for Figure 7 A magnified structural diagram at point D;

[0040] Figure 11 for Figure 6 A partial structural diagram;

[0041] Figure 12 for Figure 11 A magnified structural diagram at point E;

[0042] Figure 13 for Figure 11 A partial structural diagram;

[0043] Figure 14 for Figure 13 A magnified structural diagram at point F;

[0044] Reference numerals: 1. Base; 2. Seam welding machine; 21. Support frame; 22. Control box; 23. Lower support arm; 24. Auxiliary bracket; 25. Lower welding wheel assembly; 26. Lower welding wheel; 27. Upper support arm; 28. Upper welding wheel assembly; 29. ​​Slide rail; 210. Lifting screw; 211. Pulley assembly; 3. Displacement assembly; 31. X-axis linear module; 311. First module base; 312. X-axis translation slide plate; 313. Servo motor; 314. Protective cover; 32. Y-axis linear module; 321. 1. Second module base; 3.2. Y-axis translation slide plate; 4. Rotary assembly; 4.1. Gearbox; 4.2. Cantilever bracket; 4.3. Rotary motor; 4.4. Bearing platform; 4.5. Contouring bracket; 5. Pressing assembly; 5.1. Fixed plate; 5.2. Downward pressing cylinder; 5.3. Movable housing; 5.4. Guide shaft; 5.5. Press joint; 6. Drive assembly; 6.1. Guide sleeve; 6.2. Side slot; 6.3. Lifting slide bar; 6.4. Floating cross plate; 6.5. Support spring; 6.6. Trigger plate; 6.7. First drive shaft; 6.8. 611 First gear; 69 Second drive shaft; 610 Second gear; 7 Centering assembly; 71 First clamping module; 711 Fixed box; 712 X-axis slide bar; 713 First drive rack; 714 First drive gear; 715 Clamping side arm; 716 C-shaped chuck; 717 Universal ball; 718 Guide pin; 719 Buffer spring; 72 Second clamping module; 721 Placement box; 722 Second drive gear; 723 Y-axis slide bar; 724 725. Connecting ear plate; 8. Rotating pin; 8. Cross sliding assembly; 81. Support base plate; 82. X-axis guide rail; 83. Cross slide block; 84. First baffle; 85. Optical axis; 86. Return spring; 87. Y-axis guide rail; 88. Second baffle; 811. First base plate; 812. First electromagnet; 813. Second electromagnet; 814. Third electromagnet; 815. Second base plate; 816. Fourth electromagnet; 9. Transmission assembly; 91. Dust cover; 92. Linkage gear; 93. Lifting rack. Detailed Implementation

[0045] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0046] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Reference Figures 1-14As shown, the present invention provides an automatic welding device, which is mainly used for the automated assembly and edge roll welding of thin-walled fuel tanks in automobiles or machinery. The automatic welding device includes a base 1, a seam welding machine 2 responsible for edge flange welding, a displacement component 3 for horizontal position scheduling, a rotating component 4 responsible for displacement and attitude adjustment, and an adaptive correction and avoidance clamping structure arranged above the rotating component 4, which is composed of a clamping component 5, a cross sliding component 8, a driving component 6, a centering component 7 and a transmission component 9.

[0048] The base 1 is provided with a seam welding machine 2 and a displacement assembly 3 arranged side by side. Specifically, the seam welding machine 2 has a support frame 21 that is vertically fixed on the base 1. A control box 22 and a lower support arm 23 are fixed to the side of the support frame 21. A rotating auxiliary bracket 24 is horizontally fixed to the side of the lower support arm 23 to provide sliding support at the bottom to prevent swaying when the oil tank is rotated and welded. A lower welding wheel assembly 25 is fixed above the lower support arm 23, and a lower welding wheel 26 is provided at its end. Meanwhile, two vertical slide rails 29 are fixed on the side of the support frame 21. An upper support arm 27 is slidably mounted on the slide rails 29 via a slider. The upper support arm 27 is located directly above the lower welding wheel assembly 25. An upper welding wheel assembly 28 is fixed on the bottom surface of the upper support arm 27. The upper welding wheel assembly 28 has an upper welding wheel (not shown in the figure). A lifting screw 210 is vertically mounted in the mounting space at the top of the support frame 21. At the same time, a vertically mounted drive motor (not shown in the figure) is fixed in parallel with the lifting screw 210 inside the top of the support frame 21. A pulley assembly 211 is connected between the output end of the drive motor and the lifting screw 210. The inner side of the upper support arm 27 is threadedly connected to the lifting screw 210 through a screw seat. At the same time, an opening slot (not shown in the figure) is opened on the side of the support frame 21 for vertical displacement of the screw seat.

[0049] Among them, the lower welding wheel assembly 25 and the upper welding wheel assembly 28 are conventional electrode transmission and execution components in the existing seam welding machine 2. Specifically, the lower welding wheel assembly 25 usually integrates a conductive bearing or conductive slip ring structure to ensure the stable transmission of the large welding current. At the same time, it is equipped with a water cooling channel to reduce the high operating temperature. The lower welding wheel 26 at its end serves as the bottom rotating electrode, used to support and contact the flange bottom surface of the lower shell of the oil tank. During the actual welding operation, the upper support arm 27 descends under the drive of the lifting screw 210, so that the upper and lower welding wheels 26 clamp the edge flange of the oil tank. The rotational power of the welding wheels themselves, together with the rotating assembly 4, drives the oil tank to move. At the same time, a high-frequency pulse welding current is transmitted between the two welding wheels. The resistance heat of the contact surface melts and presses the upper and lower flange edges of the oil tank together, thereby forming a dense and airtight continuous weld.

[0050] The displacement assembly 3 includes an X-axis linear module 31 and a Y-axis linear module 32 fixed on the base 1. The two modules have the same structure and are perpendicular to each other, forming a cross translation stage. Specifically, the X-axis linear module 31 includes a concave first module base 311, which is fixed on the base 1. A servo motor 313 is fixed to one end of the first module base 311. The power output end of the servo motor 313 extends into the first module base 311 and is connected to a moving lead screw. The moving lead screw is supported on the first module base 311 by a bearing seat. The X-axis translation slide 312 is threaded to the moving lead screw and is used to perform linear translation under the drive of the servo motor 313. At the same time, a protective cover 314 is fixed on the first module base 311. There is a side gap between the protective cover 314 and the first module base 311. The X-axis translation slide 312 is slidably sleeved on the protective cover 314 to provide dust protection and sliding guidance.

[0051] Similarly, since the Y-axis linear module 32 and the X-axis linear module 31 have the same structure, the second module base 321 of the Y-axis linear module 32 is horizontally fixed on the X-axis translation slide 312 below. The second module base 321 is also equipped with a corresponding drive motor and a moving screw. The Y-axis translation slide 322 is threadedly connected to the moving screw inside the second module base 321, and is used to support the rotating component 4 above and drive it to translate in the Y-axis direction.

[0052] To ensure stable load-bearing and dynamic rotational displacement of the oil tank during the seam welding process, the rotating component 4 is mounted on the Y-axis translation slide 322 of the displacement component 3. Specifically, the rotating component 4 includes a gearbox 41, the bottom of which is fixed to the top surface of the Y-axis translation slide 322. To provide rotational power and change the transmission direction, a rotary motor 43 is fixed to the side of the gearbox 41. The power output end of the rotary motor 43 extends into the gearbox 41 and is used to change the direction of the power output of the rotary motor 43 through the gear transmission mechanism inside the gearbox 41.

[0053] A support platform 44 is provided above the gearbox 41. The support platform 44 is connected to the power output end at the top of the gearbox 41 via a vertically mounted shaft on its bottom surface, allowing the support platform 44 to rotate horizontally in a controlled manner under the drive of the rotary motor 43. Simultaneously, to provide stable support and shape limitation for the inserted oil tank, several rectangular contour brackets 45 are fixed to the upper surface of the support platform 44. These contour brackets 45 support the lower shell of the oil tank. Furthermore, a C-shaped cantilever bracket 42 is fixed to the other side of the gearbox 41. The bottom end of the cantilever bracket 42 is rigidly fixed to the side of the gearbox 41, and its main body extends upward and bends inward, so that the top end of the cantilever bracket 42 is suspended directly above the support platform 44 for fixing and supporting the clamping assembly 5.

[0054] To address the issue of tank slippage caused by traditional rigid clamping, this device incorporates a clamping assembly 5 at the top of the cantilever bracket 42. Specifically, the clamping assembly 5 includes a fixed plate 51, a downward-pressing cylinder 52, a movable housing 53, a guide shaft 54, and a pressure connector 55. The fixed plate 51 is horizontally fixed to the top of the cantilever bracket 42, and the downward-pressing cylinder 52 is vertically fixed to the top surface of the fixed plate 51, serving as the power source for vertical downward pressing. The movable housing 53 is positioned below the fixed plate 51. The power extension end of the downward-pressing cylinder 52 extends downward through the fixed plate 51 and is fixedly connected to the upper surface of the movable housing 53. The guide shaft 54 ​​is fixed to the upper surface of the movable housing 53 and extends upward through the fixed plate 51, providing vertical guidance when the downward-pressing cylinder 52 drives the movable housing 53 to rise and fall. The pressure connector 55 is located below the movable housing 53 and is used to directly contact and apply pressure to the surface of the tank's upper shell.

[0055] In order to allow the crimp connector 55 to float freely in the horizontal plane to eliminate the initial downward pressure deviation, and to be rigidly locked after alignment to prevent misalignment, a cross sliding assembly 8 is provided between the bottom of the movable housing 53 and the crimp connector 55.

[0056] Specifically, the cross-shaped sliding assembly 8 includes a sliding unit, a reset unit, a locking unit, a first baffle 84, and a second baffle 88. The sliding unit includes a supporting base plate 81, an X-axis guide rail 82, a cross-shaped slide block 83, and a Y-axis guide rail 87. The reset unit includes an optical axis 85 and a reset spring 86. The locking unit includes a first base plate 811, a first electromagnet 812, a second electromagnet 813, a third electromagnet 814, a second base plate 815, and a fourth electromagnet 816.

[0057] The upper surface of the support base plate 81 is fixedly connected to the bottom end of the upper drive assembly 6. The X-axis guide rail 82 is fixed to the bottom surface of the support base plate 81. The cross slide 83 is slidably mounted on the X-axis guide rail 82. The Y-axis guide rail 87 is slidably mounted on the bottom surface of the cross slide 83 and intersects the X-axis guide rail 82 in a cross shape. The first baffle 84 is fixed to the bottom surface of the support base plate 81 and is located at both ends of the X-axis guide rail 82. The optical axis 85 is fixed to both sides of the cross slide 83 and moves through the first baffle 84 on both sides. The reset spring 86 is sleeved on the optical axis 85 and its two ends are connected to the side of the first baffle 84 and the side of the X-axis guide rail 82, respectively. Similarly, the second baffle 88 is fixed to both ends of the Y-axis guide rail 87, and a reset unit is connected between the second baffle 88 and the side of the cross slide 83.

[0058] With the reset unit, after each oil tank welding is completed and the pressing cylinder 52 drives the pressing joint 55 to lift and reset, and the electromagnet group is de-energized and loses its magnetic force, the cross slide 83 can automatically return to the initial position of the center of the X and Y axes under the elastic force of the reset spring 86, so as to prepare for the centering of the next oil tank to be processed, and realize the cycle.

[0059] The first substrate 811 is fixed to the upper surface of the support base plate 81. The first electromagnet 812 is fixed to both sides of the first substrate 811. The second electromagnet 813 is fixed to the upper surface edge of the cross slide 83 and is magnetically attracted to the first electromagnet 812. The third electromagnet 814 is fixed to the lower surface edge of the cross slide 83. The second substrate 815 is fixed between the two second baffles 88, and the bottom surface of the second substrate 815 is fixedly connected to the upper surface of the pressure connector 55. The fourth electromagnet 816 is fixed to the upper surface of the second substrate 815 and is magnetically attracted to the third electromagnet 814. It is used to rigidly lock the cross slide 83 to the upper and lower substrates by magnetic attraction when energized.

[0060] In order to extract the reaction force after the pressure connector 55 contacts the oil tank and is pressurized, and to convert it into a mechanical trigger source for subsequent clamping and avoidance actions, the device is equipped with a drive assembly 6 inside the movable housing 53.

[0061] Specifically, the drive assembly 6 includes a trigger unit, a first transmission unit, and a second transmission unit. The trigger unit includes a guide sleeve 61, a side slot 62, a lifting slide bar 63, a floating cross plate 64, a support spring 65, and a trigger plate 66. The first transmission unit includes a first transmission shaft 67 and a first gear 68. The second transmission unit includes a second transmission shaft 69 and a second gear 610. Furthermore, a first rack 611 and a second rack are fixed to adjacent sides of the trigger plate 66, respectively.

[0062] The guide sleeve 61 is vertically and symmetrically fixed to the inner top surface of the movable housing 53. Side slots 62 are provided on opposite sides of the two guide sleeves 61. A lifting slide rod 63 is movably disposed at the bottom end of the guide sleeve 61, and one end extending into the guide sleeve 61 has a step (not shown in the figure). The two ends of the floating horizontal plate 64 pass through the side slots 62 and are respectively connected to the steps inside the two lifting slide rods 63. A support spring 65 is disposed inside the guide sleeve 61, and its two ends are respectively connected to the upper surface of the step and the inner top of the guide sleeve 61. The support spring 65 here not only serves as a lifting and resetting mechanism but also constitutes a downward triggering mechanical threshold. It ensures that only when the pressure joint 55 contacts the surface of the oil tank, and the downward pressure applied by the downward cylinder 52 overcomes the initial elastic force of the support spring 65, will the floating horizontal plate 64 substantially move upward and trigger subsequent clamping actions. This ensures that sufficient vertical clamping force is provided first, followed by lateral clamping, preventing the oil tank from being pushed away laterally before it is properly compacted.

[0063] In one of the guide sleeves 61, switches (not shown in the figure) are embedded in the upper and lower surfaces of the side slots 62. The switch on the lower surface is used to de-energize the first electromagnet 812, the second electromagnet 813, the third electromagnet 814, and the fourth electromagnet 816, while the switch on the upper surface is used to energize the electromagnets. Initially, the floating horizontal plate 64 contacts the lower switch, and the trigger plate 66 is vertically set on the floating horizontal plate 64. The supporting base plate 81 of the cross sliding assembly 8 is fixedly connected to one end of the two lifting slide rods 63 that penetrate downward through the bottom surface of the movable box 53.

[0064] The first drive shaft 67 is horizontally bearinged inside the movable housing 53. The first gear 68 is fixedly sleeved on the first drive shaft 67. The second drive shaft 69 is horizontally positioned above the movable housing 53 and crosses the first drive shaft 67. The second gear 610 is fixedly sleeved on the second drive shaft 69. The first rack 611 is adapted to mesh with the first gear 68, and the second rack is adapted to mesh with the second gear 610.

[0065] In order to utilize the power of the drive assembly 6 to achieve horizontal synchronous contraction and flexible centering clamping of the thin-walled oil tank edge, the device is equipped with a centering assembly 7 on the periphery of the movable housing 53.

[0066] Specifically, the centering component 7 includes a first clamping module 71, a second clamping module 72, and a clamping unit. The first clamping module 71 includes a fixing box 711, an X-axis slide bar 712, a first drive rack 713, and a first drive gear 714; the second clamping module 72 includes a placement box 721, a second drive gear 722, a Y-axis slide bar 723, and a second drive rack; the clamping unit includes four clamping side arms 715, a connecting ear plate 724, a rotating pin 725, a C-shaped chuck 716, a universal ball joint 717, a guide pin 718, and a buffer spring 719.

[0067] The fixed box 711 is fixed to the side of the movable box 53. One end of the first drive shaft 67 extends into the fixed box 711. The X-axis slide rod 712 is slidably arranged up and down along the inner wall of the fixed box 711. The ends of the two X-axis slide rods 712 that are far apart from each other respectively move through the two ends of the fixed box 711. Two first drive racks 713 are provided and are fixed on the opposite sides of the two X-axis slide rods 712 respectively. The first drive gear 714 is fixed to one end of the first drive shaft 67 that extends into the fixed box 711. Both first drive racks 713 mesh with the first drive gear 714. The placement box 721 is fixed on the top of the movable box 53. The second drive shaft 69, i.e., the horizontal bearing, is set inside the placement box 721. The second drive gear 722 is fixedly sleeved on the second drive shaft 69. The Y-axis slide rod 723 is slidably arranged up and down along the inner wall of the placement box 721. The ends of the two Y-axis slide rods 723 that are far apart from each other respectively move through both ends of the placement box 721. There are two second drive racks, which are fixed on the opposite sides of the two Y-axis slide rods 723 respectively. Both second drive racks mesh with the second drive gear 722.

[0068] Three clamping side arms 715 are rigidly fixed to the extended ends of two X-axis slide rods 712 and one of the extended ends of a Y-axis slide rod 723, respectively. A connecting ear plate 724 is fixed to one end of another Y-axis slide rod 723 extending out of the placement box 721 and located near the seam welding machine 2. The remaining clamping side arm 715 is movably connected to the connecting ear plate 724 via a rotating pin 725. A C-shaped chuck 716 is fixed to the inner side of one end of the clamping side arm 715. Ball 717 is disposed on the upper and lower surfaces of the inner wall of one end of C-shaped chuck 716, respectively, for contacting the upper and lower surfaces of the flanges of the upper and lower shells of the oil tank. Guide pin 718 is arranged horizontally through one end of C-shaped chuck 716 and clamping side arm 715, and one end of the guide pin 718 extending into C-shaped chuck 716 is fixed with a protruding edge, which is used to contact the edge of the oil tank flange. Buffer spring 719 is sleeved on guide pin 718, and both ends are connected to the protruding edge and the inner wall of C-shaped chuck 716 respectively.

[0069] It should be noted that when the crimp connector 55 moves downward with the movable housing 53 to contact the surface of the upper shell of the oil tank, the height position of the C-shaped chucks 716 at the ends of the first clamping module 71 and the second clamping module 72 is exactly aligned with the edge flanges of the upper and lower shells of the oil tank, thereby ensuring that when the clamping side arm 715 retracts inward, the C-shaped chucks 716 can be aligned with the clamping oil tank flange.

[0070] By setting the guide pin 718 and the protrusion as a horizontal movable structure supported by the buffer spring 719, when the oil tank is driven by the rotating component 4 to perform dynamic roll welding rotation, the movable protrusion can produce horizontal yielding and adaptive extension and retraction due to the possible change in the outline radius of the outer flange of the oil tank. This achieves dynamic flexible avoidance of the oil tank rotation movement while maintaining continuous guidance to the edge of the oil tank flange, thus avoiding the oil tank flange jamming caused by rigid limit.

[0071] In order to avoid the rolling trajectory of the subsequent seam welding machine 2 by the single-sided clamping arm 715 after the centering and clamping is completed, this device is provided with a transmission component 9 between the drive component 6 and the centering component 7. Specifically, the transmission component 9 includes a dust cover 91, a linkage gear 92, and a lifting rack 93.

[0072] The dust cover 91 is fixed to the side of the connecting ear plate 724 and coaxially sleeved on the rotating pin 725. A notch is opened on its circumferential surface. The linkage gear 92 is fixed on the rotating pin 725 and is wrapped inside the dust cover 91. The bottom end of the lifting rack 93 is vertically fixed on the floating horizontal plate 64 and moves upward through the movable box 53 and the placement box 721 in sequence. The lifting rack 93 does not mesh with the linkage gear 92 in the initial state. It is only used to cut into the notch and forcibly mesh with the linkage gear 92 when the floating horizontal plate 64 moves to the end of the high position stroke, thereby driving the clamping side arm 715 on that side to flip upward to avoid it.

[0073] The notch and the initial non-engaging design constitute a delayed triggering mechanism, which allows the lifting rack 93 to remain idle and uninterrupted during the initial and middle stages of the upward movement of the floating horizontal plate 64 (i.e., the stage when the four sides clamping the side arms 715 retract inward for centering). Only in the final stroke when the centering action is about to be completely completed will it engage the linkage gear 92 to trigger a unilateral flip, thus avoiding action interference.

[0074] Working principle: First, the lower shell of the fuel tank to be welded is placed in the contour bracket 45 of the support platform 44 for stable support and shape limitation, and then the upper shell of the fuel tank is stacked on top of it. Then, the downward cylinder 52 drives the movable box 53 to move downward as a whole, causing the bottom pressure joint 55 to contact the surface of the upper shell of the fuel tank. At this time, due to the overall height configuration, the C-shaped chucks 716 at the ends of the first clamping module 71 and the second clamping module 72 descend to the horizontal height of the edge flanges of the upper and lower shells of the fuel tank, so as to prepare for the subsequent clamping and centering action in terms of height and spatial alignment.

[0075] The downward pressing cylinder 52 continues to output downward pressing force, and the pressing joint 55 is pushed upward by the reaction force of the surface of the upper shell of the oil tank. When the reaction force overcomes the initial elasticity threshold of the support spring 65 in the guide sleeve 61, it forces the lifting slide bar 63 and the floating cross plate 64 to start moving upward inside the movable box 53. The setting of this elasticity threshold ensures that sufficient vertical pressing force is provided first to initially stabilize the oil tank before triggering the lateral clamping action, so as to avoid the oil tank from shifting laterally before being compacted. In this initial pressing stage, the electromagnet group in the cross sliding assembly 8 is in a de-energized and demagnetized state, and the pressing joint 55 has free floating degree in the X-axis and Y-axis directions, thereby effectively eliminating the horizontal bias force generated at the moment of downward contact and preventing the upper shell of the oil tank from being initially misaligned due to rigid force.

[0076] As the floating horizontal plate 64 continues to move upward, the first rack 611 and the second rack fixed on the trigger plate 66 mesh with the first gear 68 and the second gear 610 respectively, converting the vertical displacement power into horizontal rotational power. This power, through the first drive shaft 67 and the second drive shaft 69, synchronously drives the first drive gear 714 and the second drive gear 722 inside the fixed box 711 and the placement box 721 to rotate, thereby causing the X-axis slide rod 712 and the Y-axis slide rod 723 around the perimeter to retract linearly. At this time, the four clamping side arms 715 synchronously close towards the center, and the convex edge inside the C-shaped chuck 716 smoothly contacts and flexibly pushes against the flange surface. Relying on the equidistant linkage formed by the gears and the double racks, the upper shell of the oil tank in the floating state is driven to slide horizontally, aligning it with the lower shell of the oil tank that is fixed in place, eliminating the initial placement deviation.

[0077] When the floating horizontal plate 64 moves to the end of its stroke, the lifting rack 93 passes over the dust cover 91 and is in the idle stroke with the notch slot, engaging with the linkage gear 92. That is, there is a smooth rod area at the upper end of the lifting rack 93, which drives the clamping side arm 715 near the seam welding machine 2 to rotate upward by 90 degrees, providing processing space for the intervention of the welding wheel. This ensures that the inward retraction and centering action of the clamping side arms 715 on all four sides comes first, followed by the single-sided rotation and avoidance action, preventing mutual interference of the spatial clamping logic. At the same time, the floating horizontal plate 64 touches the switch at the upper end of the side slot 62, and the first electromagnet 812, the second electromagnet 813, the third electromagnet 814, and the fourth electromagnet 816 are energized simultaneously. At this time, the first electromagnet 812 fixed on the first base plate 811 and the second electromagnet 813 on the cross slide 83 are magnetically attracted to each other. At the same time, the fourth electromagnet 816 fixed on the second base plate 815 and the third electromagnet 814 on the cross slide 83 are magnetically attracted to each other. The cross slide 83 is locked to the first base plate 811 and the second base plate 815 respectively by the attraction of the upper and lower sets of electromagnets. The pressure joint 55 then switches from a floating state to a fixed state to maintain the relative position of the upper shell of the oil tank after alignment and prevent secondary misalignment.

[0078] After the clamping and locking actions are completed, the translation slide of the displacement assembly 3 sends the oil tank into the processing area of ​​the seam welding machine 2. The upper and lower roller welding wheels 26 press against the edge of the oil tank flange and are energized. Subsequently, the rotary motor 43 drives the bearing platform 44 to rotate the oil tank. During the rotation processing, the remaining three clamping side arms 715 and the locked pressure joint 55 together provide friction and lateral restraint to resist the tangential torque generated by the roller welding. The guide pin 718 and the flange supported by the buffer spring 719 make horizontal retraction according to the radius change of the flange profile to adapt to the rotation of the oil tank.

[0079] When the seam welding machine 2 stops working, the downward pressure cylinder 52 drives the movable housing 53 to rise as a whole, and the pressure joint 55 disengages from the surface of the oil tank, losing its upward reaction force. At this time, the support spring 65 in the guide sleeve 61 releases its elastic force, pushing the lifting slide bar 63 and the floating cross plate 64 to return to their downward position relative to the movable housing 53.

[0080] During the downward movement of the floating horizontal plate 64, the following synchronous reset action occurs: First, the floating horizontal plate 64 disengages from the switch at the upper end of the side slot 62 and contacts the switch at the lower end, causing the first electromagnet 812, the second electromagnet 813, the third electromagnet 814, and the fourth electromagnet 816 to be de-energized and demagnetized. After the cross slide 83 loses its magnetic locking force, it automatically slides along the optical axis 85 and the guide rail and returns to its initial physical center position under the elastic force of the reset spring 86 in the X and Y axis directions.

[0081] Secondly, the lifting rack 93 fixed on the floating horizontal plate 64 moves down, and in the initial stage of the downward movement, it drives the linkage gear 92 on the rotating pin 725 to rotate, so that the clamping side arm 715, which was previously flipped upward, rotates downward 90 degrees to return to the horizontal state. Then the lifting rack 93 enters the notch groove of the dust cover 91 and disengages.

[0082] Finally, the first rack 611 and the second rack on the trigger plate 66 move downwards, driving the first gear 68, the second gear 610, the first transmission shaft 67, and the second transmission shaft 69 to rotate in the opposite direction. The gear and rack transmission mechanism runs in reverse, causing the X-axis slide bar 712 and the Y-axis slide bar 723 in the fixed box 711 and the placement box 721 to retract outwards, driving the four clamping side arms 715 to open outwards synchronously, releasing the clamping of the oil tank flange.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automatic welding device, characterized in that, include: Base (1); A seam welding machine (2) is mounted on the base (1) and is used to weld the oil tank; The displacement component (3) is mounted on the base (1) and is used to drive the oil tank to move horizontally. A rotating component (4) is disposed on the displacement component (3) for supporting the oil tank and driving the oil tank to rotate; The clamping assembly (5) is disposed above the rotating assembly (4) and has a movable housing (53) and a crimping head (55). A cross-sliding assembly (8) is disposed between the movable housing (53) and the pressure joint (55) to enable the pressure joint (55) to generate an adaptive floating displacement in the horizontal plane at the instant it is initially pressed vertically downward and contacts the upper shell of the oil tank. The drive assembly (6) is disposed inside the movable housing (53) and connected to the top of the cross sliding assembly (8), and is used to be triggered when the crimp joint (55) moves upward under the reaction force; The centering component (7) is located on the periphery of the movable housing (53) and is connected to the drive component (6) for driving inward to clamp and center the four sides of the oil tank. A transmission assembly (9) is disposed between the drive assembly (6) and the centering assembly (7) for driving one side of the centering assembly (7) to flip upward after being clamped by the centering assembly (7) to avoid the seam welding machine (2). The cross sliding assembly (8) includes a sliding unit, a reset unit, a first baffle (84), and a second baffle (88). The sliding unit includes a supporting base plate (81), an X-axis guide rail (82), a cross slide (83), and a Y-axis guide rail (87). The reset unit includes an optical axis (85) and a reset spring (86). The supporting base plate (81) is connected to the bottom end of the driving assembly (6). The X-axis guide rail (82) is fixed to the bottom surface of the supporting base plate (81). The cross slide (83) is slidably disposed on the X-axis guide rail (82). The Y-axis guide rail (87) is slidably disposed on the bottom surface of the cross slide (83) and is connected to the X-axis guide rail (82). The X-axis guide rail (82) is cross-shaped. The first baffle (84) is fixed on the bottom surface of the support base plate (81) and located at both ends of the X-axis guide rail (82). The optical axis (85) is fixed on both sides of the cross slide (83) and moves through the first baffle (84) on both sides respectively. The reset spring (86) is sleeved on the optical axis (85) and its two ends are respectively connected to the side of the first baffle (84) and the side of the X-axis guide rail (82). The second baffle (88) is fixed on both ends of the Y-axis guide rail (87). The reset unit is connected between the second baffle (88) and the side of the cross slide (83). The cross-shaped sliding assembly (8) also includes a locking unit; The drive assembly (6) is triggered when the crimping joint (55) moves upward under the reaction force, and the centering assembly (7) on the periphery retracts inward to push and clamp the four sides of the oil tank synchronously. The cross sliding assembly (8) switches the crimping joint (55) from the floating state and locks it rigidly. At the same time, the transmission assembly (9) drives the side of the centering assembly (7) closest to the seam welding machine (2) to flip upward to make room for processing.

2. The automatic welding device according to claim 1, characterized in that: The locking unit includes a first base plate (811), a first electromagnet (812), a second electromagnet (813), a third electromagnet (814), a second base plate (815), and a fourth electromagnet (816). The first base plate (811) is fixed to the upper surface of the support base plate (81). The first electromagnet (812) is fixed to both sides of the first base plate (811). The second electromagnet (813) is fixed to the upper surface edge of the cross slide (83) and is parallel to the first electromagnet (814). 2) Adapted for magnetic attraction, the third electromagnet (814) is fixed on the lower surface edge of the cross slide (83), the second base plate (815) is fixed between the two second baffles (88), and the bottom surface of the second base plate (815) is fixedly connected to the upper surface of the crimp connector (55). The fourth electromagnet (816) is fixed on the upper surface of the second base plate (815) and is adapted for magnetic attraction with the third electromagnet (814) to rigidly lock the cross slide (83) when energized.

3. The automatic welding device according to claim 2, characterized in that: The drive assembly (6) includes a trigger unit, which includes a guide sleeve (61), a side slot (62), a lifting slide rod (63), a floating cross plate (64), a support spring (65), and a trigger plate (66). The guide sleeve (61) is vertically and symmetrically fixed to the inner top surface of the movable housing (53). The lifting slide rod (63) is movably disposed at the bottom end of the guide sleeve (61), and one end of the slide rod (63) extending into the guide sleeve (61) has a step. The two ends of the floating cross plate (64) pass through the side slot (62) and are respectively connected to the two steps. The support spring (65) is disposed on the guide sleeve (61). Inside the guide sleeve (61), and at both ends connected to the upper surface of the step and the top of the inside of the guide sleeve (61) respectively, a switch is embedded in the upper and lower surfaces of the side slot (62) of one of the guide sleeves (61). The switch on the lower surface is used to control the electromagnet to de-energize, and the switch on the upper surface is used to control the electromagnet to be energized and locked. Initially, the floating horizontal plate (64) contacts the lower switch. The trigger plate (66) is vertically set on the floating horizontal plate (64). The cross sliding assembly (8) is fixedly connected to one end of the two lifting slide rods (63) that penetrate the bottom surface of the movable box (53).

4. An automatic welding device according to claim 3, characterized in that: The drive assembly (6) further includes a first transmission unit and a second transmission unit. The first transmission unit includes a first transmission shaft (67) and a first gear (68). The second transmission unit includes a second transmission shaft (69) and a second gear (610). The first transmission shaft (67) is horizontally mounted inside the movable housing (53). The first gear (68) is fixedly mounted on the first transmission shaft (67). The second transmission shaft (69) is horizontally mounted above the movable housing (53) and crosses the first transmission shaft (67). The second gear (610) is fixedly mounted on the second transmission shaft (69). The adjacent sides of the trigger plate (66) are respectively fixed with a first rack (611) and a second rack. The first rack (611) is adapted to mesh with the first gear (68), and the second rack is adapted to mesh with the second gear (610).

5. An automatic welding device according to claim 4, characterized in that: The centering component (7) includes a first clamping module (71) and a second clamping module (72). The first clamping module (71) includes a fixed box (711), an X-axis slide rod (712), a first drive rack (713), and a first drive gear (714). The second clamping module (72) includes a placement box (721), a second drive gear (722), a Y-axis slide rod (723), and a second drive rack. The fixed box (711) is fixed to the side of the movable box (53). One end of the first transmission shaft (67) extends through the fixed box (711). The X-axis slide rod (712) slides up and down along the inner wall of the fixed box (711). The ends of the two X-axis slide rods (712) that are far apart from each other respectively move through both ends of the fixed box (711). Two first drive racks (713) are provided and fixed to the opposite faces of the two X-axis slide rods (712), respectively. The first drive gear (714) is fixed to one end of the first transmission shaft (67) that extends into the fixed box (711). Both first drive racks (713) mesh with the first drive gear (714). The placement box (721) is fixed to the top of the movable box (53). The second transmission shaft (69) is horizontally bearing disposed in the placement box (721). Inside the box (721), the second drive gear (722) is fixedly sleeved on the second transmission shaft (69). The Y-axis slide rod (723) is slidably arranged up and down along the inner wall of the box (721). The ends of the two Y-axis slide rods (723) that are far apart from each other respectively move through the two ends of the box (721). There are two second drive racks, which are fixed on the opposite surfaces of the two Y-axis slide rods (723). Both second drive racks mesh with the second drive gear (722).

6. An automatic welding device according to claim 5, characterized in that: The centering assembly (7) further includes a clamping unit, which includes four clamping side arms (715), a connecting ear plate (724), and a rotating pin (725). Three of the clamping side arms (715) are fixed to the extended ends of two X-axis slides (712) and one of the Y-axis slides (723), respectively. The connecting ear plate (724) is fixed to one end of another Y-axis slide (723) that extends out of the placement box (721) and is located on the side close to the seam welding machine (2). The remaining clamping side arm (715) is movably connected to the connecting ear plate (724) through the rotating pin (725) for flipping upwards during subsequent welding to avoid the seam welding machine (2).

7. An automatic welding device according to claim 6, characterized in that: The clamping unit also includes a C-shaped chuck (716), a universal ball (717), a guide pin (718), and a buffer spring (719). The C-shaped chuck (716) is fixed to the inner side of one end of the clamping side arm (715). The universal ball (717) is disposed opposite to the upper and lower surfaces of the inner wall of one end of the C-shaped chuck (716) for contacting the upper and lower flange surfaces of the upper and lower shells of the oil tank, respectively. The guide pin (718) is horizontally movably inserted through one end of the C-shaped chuck (716) and the clamping side arm (715), and one end of the pin extending into the C-shaped chuck (716) is fixed with a protrusion for contacting the flange edge of the upper and lower shells of the oil tank. The buffer spring (719) is sleeved on the guide pin (718), and both ends are connected to the protrusion and the inner wall of the C-shaped chuck (716), respectively.

8. An automatic welding device according to claim 7, characterized in that: The transmission assembly (9) includes a dust cover (91), a linkage gear (92), and a lifting rack (93). The dust cover (91) is fixed to the side of the connecting ear plate (724) and coaxially sleeved on the rotating pin (725). A notch is provided on its circumferential surface. The linkage gear (92) is fixed on the rotating pin (725) and located inside the dust cover (91). The lifting rack (93) is fixed on the floating horizontal plate (64) and moves upward sequentially through the movable box (53) and the placement box (721). Initially, the lifting rack (93) does not mesh with the linkage gear (92) but is used to mesh with the linkage gear (92) through the notch when the floating horizontal plate (64) moves upward.

9. An automatic welding device according to claim 1, characterized in that: The rotating assembly (4) includes a gearbox (41), a cantilever bracket (42), a rotary motor (43), a bearing platform (44), and a contour bracket (45). The gearbox (41) is fixed on the displacement assembly (3), the cantilever bracket (42) is fixed on the side of the gearbox (41), the clamping assembly (5) is fixedly supported on the top of the cantilever bracket (42), the rotary motor (43) is fixed on the side of the gearbox (41), the bearing platform (44) is connected to the output end of the gearbox (41) through the rotating shaft on the bottom surface, and the contour bracket (45) is fixed on the bearing platform (44) for supporting and limiting the lower shell of the oil tank.

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